Hose with a protector

ABSTRACT

A hose with a protector includes a tubular-shaped hose body; a tubular-shaped protector which is coaxially provided to cover the outer peripheral surface of the hose body; a tubular-shaped engager which bonds the hose body and the protector integrally at both edge portions thereof and which forms an inserting opening into which a nipple is inserted and bonded. By producing the hose body out of resin and producing the protector out of rubber, the present hose with a protector can obtain heat resistance and anti-flame resistance which are suitable for a filler hose and which are necessary at the time of vehicle fire and also the present hose with a protector is good in sealing property with the mating pipe and good in connecting function.

This is a divisional of application Ser. No. 08/392,968, filed Feb. 14,1995 now abandoned.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a hose with a protector having highresistance to harm such as heat and flame from the outer peripheralsurface side. The hose with a protector according to the presentinvention is optimum for transferring gasoline, lamp oil and chemicaldrugs.

2. Description of the Related Art

As the conventional hose with a protector, the hose comprising atubular-shaped protector which coaxially covers the outer periphery sideof a hose body transferring liquid has been known. This type ofconventional hose with a protector is described in Japanese UnexaminedUtility Model Publication Nos. 174192/1987, 18488/1981, 188087/1986 and46194/1990 (Kokai). In these publications, various inventions have beenmade so as to form the space between the hose body and thetubular-shaped protector which covers the hose body. Furthermore,concerning the joint of a hose with a protector, the invention utilizinga splicing fitting is described in Japanese Utility Model PublicationNo. 34548/1991 (Kokoku).

SUMMARY OF THE INVENTION

The conventional hose with a protector has a structure in which a partor the whole of the hose body is covered by a protector. Accordingly,when the conventional hose with a protector is connected to the otherdevice, some hardware which is particularly designed is needed. Also,when the conventional hose with a protector is connected to a nipple, itis necessary to insert the nipple directly into the hose body of thehose with a protector. Therefore, it is necessary to make a hose bodyout of elastic rubber or elastomer and a hose body cannot be made out ofresin having high rigidity.

It is an object of the present invention to solve the above-mentionedproblems and to provide a hose with a protectors which is easilyequipped with a nipple.

The hose with a protector of the present invention comprises: atubular-shaped hose body; a tubular-shaped protector which is coaxiallyprovided in the state in which it covers the outer peripheral surface ofthe hose body and a tubular-shaped engager which integrally bonds thehose body and the protector integrally at both ends portion thereof andforms a nipple insertion opening where a nipple is inserted andconnected. In the hose with a protector according to the presentinvention, the engager is integrally formed, therefore it is easy toconnect to the other apparatus such as a nipple or the like. Further,the engager fastens the hose body and the protector integrally,therefore the hose body and the protector are well integrated with eachother.

As the hose body which comprises the hose with a protector of thepresent invention, the hose body of the conventional hose with aprotector can be used as it is. Namely, as the present hose body, theconventional hoses such as a rubber hose, an elastomer hose, a resinhose and a double hose whose inner peripheral portion is made of resinand outer peripheral portion is made of rubber can be used. By using aresin hose as the present hose body, the present hose with a protectorhaving improved anti-gasoline permeability can be obtained.

The portion where the hose body and the engager are contacted, namelythe edge portion of the hose body, can be formed into the shape having aconcave shaped ring or a convex shaped ring seen from the innerperipheral surface side which goes around in the circumferentialdirection. This ring serves to an engaging portion which is forimproving the integral relation between the hose body and the engager orserves to an engaging portion which is directly or indirectly engaged tothe convex shaped ring or the concave shaped ring which are provided atthe tip portion's outer peripheral surface of the nipples which isinserted and kept into the engager. The edge portion of the hose body,which is brought into contact with the engager and which is positionedat the outer peripheral surface side of the inserted nipple and ispreferably formed into a corrugated shape whose surface has concaveportions and convex portions in the peripheral direction. Because of thecorrugated configuration having irregularity in the peripheral directiondescribed above, the diameter of edge portion of the hose body can beenlarged and it is easy to insert the nipple into it.

As a protector, the above-mentioned conventional protector can be usedas it is. When the heat resistance and flame resistance property isrequired for the protector, the protector is preferably made of rubber.By forming the protector out of rubber, one can avoid the eliminationcaused by melting when the protector is formed out of a thermal plasticresin. Therefore, the influence of heat and flame on the hose body canbe prevented for a long time.

The protector comprises a pair of portions. One edge portion of oneportion of the protector is fitted into one edge portion of the otherportion of the protector and they may be displaced relatively in theaxial direction.

The engager can choose any of the following constructions: the engageris integrally formed with the protector; the edge portion of theprotector, which is formed in advance, is inserted into the engager andthey are formed integrally; the engager is formed independently from theprotector and after that, the engager and the protector may beincorporated.

It is preferable that the engager is made of a rubber elastic body, itsdiameter is enlarged by the nipple which is inserted into the engagerand the engager clamps the nipple elastically. Accordingly, the axialhole of the engager should have the shape which corresponds to the outerperipheral diameter and the outer peripheral shape of the nipple whichis inserted. As the shape of the above-mentioned axial hole, the shapeof the conventional axial hole can be employed.

The edge portion of the hose body is contacted with the engager. Bymaking the engager of rubber and making the hose body of resin, theportion of the engager, which is coaxially Positioned between the nipplewhich is inserted and held and the hose body, can be used as the sealingportion.

The engager may be insertion molded so as to bury the edge portion ofthe hose body. Or the engager may be formed so as to include a ringshaped ring groove having a bottom. This ring groove opens in the ringshape on the inner peripheral surface into which the edge portion of thehose body is inserted and the depth of this ring groove becomes deeperas it is parallel in the axial direction or as it inclines to the axialdirection. And the edge portion of the hose body can be inserted andengaged in the bottom-owned ring groove.

The portion, which becomes the inner peripheral surface side of theengager, may be formed in tubular shape which is integral with theportion, which becomes the outer peripheral surface side of the engager.And then, the portion which becomes the inner peripheral surface sidecan be formed by coaxially folding toward the inside of the portionwhich becomes the outer peripheral surface side. In this case, thenipple is inserted and kept by the axial hole which is formed at theinner peripheral surface side folded in. When the nipple is inserted orpulled out, there may be a fear that the inner peripheral surface sidefolded in may move relatively to the outer peripheral surface thereof inthe axial direction by the resulting force in the axial direction. Inorder to avoid this relative movement, a concave portion is preferablyformed at one portion at which the inner peripheral surface side and theouter peripheral surface side are contacted and a convex portion ispreferably formed at the other portion thereof.

The ring groove which is formed between the inner peripheral surfaceside and the outer peripheral surface side which are folded can be aring groove into which the edge portion of the hose body is inserted.Then, between the hose body which is inserted and the inner peripheralsurface side which is folded in, it is preferable to form a portion withincreased resistance in the axial direction. In the portion withincreased resistance, a concave shaped ring or a convex shaped ringwhich extends in the circumferential direction can be formed at oneportion and a convex shaped ring or a concave shaped ring which isshaped symmetrical to the above mentioned ring and which extends in thecircumferential direction can be formed at the other portion.

By engaging the pair of rings, it is possible to integrate the hose bodyand the folded portion of the engager.

At the outer peripheral surface of the engager which is integrated bycontact, an outer ring which fastens this outer peripheral surface in aring shape may be provided. And at the inner peripheral surface of theedge portion of the hose body which is integrated, an inner ring in aring shape to support the inner peripheral surface thereof may beprovided. By providing the outer ring and inner ring, the integrity ofthe engager and the hose body is improved.

Further, the engager may be formed as the separate body from theprotector and the hose body. And at the outer peripheral surface of theengager, the edge portion of the protector may be integrated by engagingit coaxially and at the inner peripheral surface of the engager, theedge portion of the hose body may be integrated by mounting itcoaxially. In this case, it is preferable to provide an outer ring whichfastens the outer peripheral surface thereof in ring shape to the outerperipheral surface of the protector and to provide an inner ring whichsupports the inner peripheral surface thereof on the inner peripheralsurface of the edge portion of the hose body.

The hose with a protector of the present invention integrates the hosebody and the protector at the engager. At the engager, the nipple isformed so as to be inserted and fixed. Therefore some hardware forconnecting is not necessary. By forming the protector and the engagerintegrally, the number of components can be reduced and themanufacturing cost and the work efficiency of the assembly is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete appreciation of the present invention and many of itsadvantages will be readily obtained as the same becomes betterunderstood by reference to the following detailed description whenconsidered in connection with the accompanying drawings and detailedspecification, all of which forms a part of the disclosure:

FIG. 1 is a broken fragmentary longitudinal cross sectional view of ahose with a protector of a First Preferred Embodiment of the presentinvention;

FIGS. 2(a) through 2(f) are cross sectional views which illustrates anoutline of the steps of the production process of the hose with aprotector of the First Preferred Embodiment;

FIGS. 3(a) and 3(b) are cross sectional views which illustrate anoutline of a major portion of the present hose with and without aprotector irespectively, of a Second Preferred Embodiment;

FIG. 4 is an enlarged fragmentary longitudinal cross sectional viewwhich illustrates a connecting portion and the vicinity of returning ina return portion which comprise an engager of the present hose with aprotector of a Third Preferred Embodiment;

FIG. 5 is an enlarged fragmentary longitudinal cross sectional viewwhich illustrates a connecting portion and the vicinity of returning ina return portion which comprise an engager of the present hose with aprotector of a Fourth Preferred Embodiment;

FIGS. 6(a) through 6(d) are enlarged fragmentary longitudinal crosssectional views which illustrate four alternative connecting portionsand a vicinity of returning in a return portion which comprise fouralternative engagers of the present hose with a protector of a FifthPreferred Embodiment;

FIG. 7 is an enlarged fragmentary longitudinal cross sectional viewwhich illustrates a connecting portion and the vicinity of returning ina return portion which comprise an engager of the present hose with aprotector of a Sixth Preferred Embodiment;

FIG. 8 is an enlarged fragmentary longitudinal cross sectional viewwhich illustrates a connecting portion and the vicinity of returning ina return portion which comprise an engager of the present hose with aprotector of a Seventh Preferred Embodiment;

FIGS. 9(a) through 9(d) are enlarged fragmentary longitudinal crosssectional views which illustrate four alternative connecting portionsand a vicinity of returning in a return portion which comprise fouralternative engagers of the present hose with a protector of an EighthPreferred Embodiment;

FIGS. 10(a) through 10(c) are enlarged fragmentary longitudinal crosssectional views which illustrate three alternative connecting portionsand a vicinity of returning in a return portion which comprise threealternative engagers of the present hose with a protector of a NinthPreferred Embodiment;

FIGS. 11(a) and 11(b) are enlarged fragmentary longitudinal crosssectional views which illustrate two alternative connecting portions anda vicinity of returning in a return portion which comprise twoalternative engagers of the present hose with a protector of a TenthPreferred Embodiment;

FIGS. 12(a) and 12(b) are enlarged fragmentary longitudinal crosssectional views which illustrate two alternative connecting portions anda vicinity of returning in a return portion which comprise twoalternative engagers of the present hose with a protector of an EleventhPreferred Embodiment;

FIG. 13 is a broken fragmentary cross sectional view of a hose with aprotector of a Twelfth Preferred Embodiment;

FIGS. 14(a) through 14(d) are cross sectional views which illustrate theoutline of the steps of the production process of a hose with aprotector of a Thirteenth Preferred Embodiment;

FIG. 15 is a broken fragmentary cross sectional view of a hose with aprotector of a Fourteenth Preferred Embodiment;

FIG. 16 is a broken fragmentary cross sectional view of a hose with aprotector of a Fifteenth Preferred Embodiment;

FIG. 17 is a broken fragmentary cross sectional view of a hose with aprotector of a Sixteenth Preferred Embodiment;

FIG. 18 is an enlarged fragmentary cross sectional view whichillustrates an engager and an edge portion of the hose body of thepresent hose with a protector of a Seventeenth Preferred Embodiment;

FIG. 19 is an enlarged fragmentary cross sectional view whichillustrates an engager and an edge portion of the hose body of thepresent hose with a protector of an Eighteenth Preferred Embodiment;

FIG. 20 is an enlarged fragmentary cross sectional view whichillustrates an engager and an edge portion of the hose body of thepresent hose with a protector of a Nineteenth Preferred Embodiment;

FIG. 21(a) is an enlarged fragmentary cross sectional view whichillustrates an engager and FIG. 21(b) is a sectional view taken alongline 21--21 of; an edge portion of the hose body of the present hosewith a protector of an Twentieth Preferred Embodiment;

FIG. 22(a) is a broken fragmentary cross sectional view of the presenthose with a protector of a Twenty-first Preferred Embodiment, FIG. 22(b)is a fragmentary cross sectional view of the present hose with aprotector of a Twenty-first Preferred Embodiment and FIG. 22(c) is anouter appearance view which illustrates the outline of the present hosewith a protector of a Twenty-first Preferred Embodiment;

FIG. 23 is a broken fragmentary cross sectional view of a hose with aprotector of a Twenty-second Preferred Embodiment;

FIGS. 24(A) through 24(D) are cross sectional views which illustratesthe outline the four parts of one step for producing a resin ring of ahose with a protector according to the Twenty-second PreferredEmbodiment;

FIG. 25 is a broken fragmentary cross sectional view of a hose with aprotector of a Twenty-third Preferred Embodiment; and

FIGS. 26(a) and 26(b) are a cross sectional views which illustrate amajor portion in full and dotted lines of a modified version of a hosewith a protector of the Twenty-third Preferred Embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Having generally described the present invention, a furtherunderstanding can be obtained by reference to the specific preferredembodiment which is provided herein for purposes of illustration onlyand are not intended to limit the scope of the appended claims.

First Preferred Embodiment

FIG. 1 is a broken fragmentary front view which illustrates the state inwhich a hose with a protector for an automobile fuel hose according to aFirst Preferred Embodiment is engaged with a connected pipe (nipple 50).A resin hose F comprises a tubular-shaped hose body 10 which is made ofresin and which is provided inside; a protector 20 which isconcentrically provided at the outside of the hose body 10 and which ismade of fire resistant rubber; and an engager 30 which is integrallyformed with the protector 20.

The hose body 10 is made of polyamide resin and it comprises a bellowsshaped portion 11 having a predetermined length and combined edgeportions 12 (hereinafter referred to as an edge portion) which istubular shaped and which is provided at both sides of the bellows shapedportion.

The protector 20 is provided with a bellows shaped portion 21 which issubstantially adhered to the bellows shaped portion 11 of the hose body10 and an engager 30 which is integrally formed at both ends thereof.The engager 30 is extended toward the outside of edge portion 12 and aconnecting portion 35 which is integrally overlapped on the outerperipheral surface of the edge portion 12 of the hose body 10. Theengager 30 includes a return portion 38 which is integrally overlappedon the inner peripheral surface side of the edge portion 12. It may useelastic and fire resistant resins such as a vinyl chloride resin or thelike besides rubber in order to produce the protector 20 and engager 30.

Referring to FIG. 2, the outline of a production process of theabove-mentioned hose with a protector will be explained as follows.

First as shown in FIG. 2(a), there is prepared the protector 20 which ismade of fire resistant rubber and with which the return portion 38 andthe connecting portion 35 is connected in tubular shape and in the axialdirection. The protector having the engager 30 is generally produced bythe production method of a rubber hose using a general core. Next asshown in FIG. 2(b), an edge tool 41 is inserted into and engaged withthe inner peripheral surface side of the return portion 38 of bothedges. Then as shown in FIG. 2(c), it is inserted into and engaged witha die 40 and a parison 15 made of polyamide resin is inserted into theaxial hole of the protector 20 having the engager 30. Then as shown inFIG. 2(d), at an extrusion portion from the edge tool 41 of the parison15, the inside of the parison 15 is excluded from outside air by apresser portion 42 at both ends of the die 40. High pressure air isblown into the inside of the parison 15 through an air supply pipe 43which is inserted inside and the parison 15 is inflated so as to get tofit the inner wall of the protector 20 having the engager 30. Afterthat, the protector 20 which has engager 30 and which includes themolded parison 15 is extracted from the die 40. After removing the edgetool 41, as shown in FIG. 2(e), a rotary knife 42 is inserted into theclearance thereof so as to cut off the parison 15 and the portion of theparison 15 which becomes the hose body 10. Therefore as shown in FIG.2(f), it is able to obtain the protector 20 having the engager 30 in thestate in which the return portion 38 of the edge portion is extended inthe axial direction. By bending the return portion 38 at the end of thisrubber protector 20, as shown in FIG. 1, the protector 20 having theengager 30 is obtained.

In the hose with a protector of this First Preferred Embodiment, thereturn portion 38 of the engager 30 is folded back so as to superpose onthe inner side of the edge portion 12 of the hose body 10. Therefore,when the nipple 50 is fitted, the return portion 38 is located betweenthe edge portion 12 of the hose body 10 and the nipple 50. So the hosewith a protector of this First Preferred Embodiment can secure thesealing ability of the connecting portion thereof for theabove-mentioned reasons. Accordingly, it is not necessary to prepare arubber cap so as to secure the sealing ability at the portion connectingthe hose body 10 and the nipple 50 as the conventional hose with aprotector needs the rubber cap. Therefore a die for molding the rubbercap is not necessary and also the process for molding the rubber cap andfitting it are not needed. Accordingly, the present invention can supplythe hose with a protector having improved anti-gasoline permeability andimproved fire resistance at a low cost.

Second Preferred Embodiment

As shown FIG. 3(a), in the hose with a protector according to thisSecond Preferred Embodiment, a protector 20 having an engager 30 isprepared. This engager 30 has the same construction as that of the FirstPreferred Embodiment except that a protector of the Second PreferredEmbodiment is different from the protector 20 having the engager 30 ofthe First Preferred Embodiment and that the Second Preferred Embodimentincludes a ring groove 36 which goes around in the circumferentialdirection on the inner peripheral surface side of a connecting portion35 of the engager 30. And the material of this Embodiment is the same asthat of the First Preferred Embodiment.

As shown in FIG. 3(b), when a hose body 10 is formed on the innerperipheral surface side of the protector 20 with the engager 30 havingthe ring groove 36 by using the same method as that of the FirstPreferred Embodiment, a parison is formed along the ring groove 36. Thering groove 36 is overlapped so that the edge portion of the hose body10 goes around in the circumferential direction and there is provided aconcave-shaped ring 13 at the convex inner peripheral surface side andat the outer peripheral side, whose diameter is enlarged. The returnportion 38 is overlapped on this concave-shaped groove of this ring 13.

In the hose with a protector of this Second Preferred Embodiment, themovement, which is relative to the return portion 38 and the edgeportion 12 of the hose body 10 in the axial direction, is regulated bythe ring 13 of the hose body 10. Accordingly, when the nipple isinserted and fixed, the return portion 38 is regulated to moverelatively to the edge portion 12 of the hose body 10 in the axialdirection. On the outer peripheral surface of the tip portion of thenipple which is inserted and fixed, there is formed a convex-shaped ringwhich is engaged with the concave-shaped groove so that it secures theinserting and engaging of the nipple more reliably. The insertionresistance is increased just before the inserting and engaging of thenipple and the insertion resistance is reduced at the time of engaging.So there is an advantage that one can easily know the inserting andengaging of the nipple.

Third Preferred Embodiment

Next, the Third Preferred Embodiment of the present hose with aprotector will be hereinafter described with reference to FIG. 4. In thehose with a protector of the Third Preferred Embodiment, the returnportion 38 of the engager 30 is thicker than the connecting portion 35.As mentioned above, the thickness of the return portion 38, which isdeformed at the time of inserting of the nipple, is increased.Accordingly, when the nipple 50 is inserted into the hose with aprotector, it becomes easy to absorb, at the return portion 38, thedeformation caused by the enlargement of diameter by the nipple and itbecomes easy to insert the nipple 50.

Fourth Preferred Embodiment

Next, the Fourth preferred Embodiment of the present hose with aprotector will be hereinafter described with reference to FIG. 5. Inthis Fourth Preferred Embodiment, the outer diameter rA of the returnportion 38 of the engager 30 is smaller than the inner diameter rB ofthe connecting portion 35. Owing to this, when the return portion 38 isbent toward the inner peripheral surface of the edge portion 12 of thehose body 10, sagging and winkle at the overlapping portion of the edgeportion 12 of the hose body 10 by the return portion 38 are hardlyproduced. Accordingly, the adhesion among the return portion 38, theinner peripheral side of the edge portion 12 of the hose body 10 and thenipple 50 can be improved and the sealing ability of the hose with aprotector can be improved.

Fifth Preferred Embodiment

Next, the Fifth Preferred Embodiment of the present hose with aprotector will be hereinafter described with reference to FIG. 6. Asshown in FIG. 6(a), in this hose with a protector, the boundary portion37 between the return portion 38 of the engager 30 and the connectingportion 35 is thinner than the thickness of the other portions. Owing tothis, when the return portion 38 is bent, the bent portion becomesthinner and the build-up at this portion can be prevented from beinggenerated. Because the opening portion of the hose with a protector isnot narrowed, it is easy to insert the nipple 50 into the hose. As shownin FIGS. 6(b) through 6(d), the thin portions can be provided on thereturn portion 38 sides. Especially shown in FIG. 6(c) and 6(d), whenthe cavity is provided on the outer side, the opening portion of theengager 30 becomes the taper-shaped opening whose inner diameter isextended toward the opening edge in a funnel shape when the returnportion 38 is folded back. Therefore it is easy to insert the nipple 50into the engager 30.

Sixth Preferred Embodiment

Next, the Sixth Preferred Embodiment of the present hose with aprotector will be hereinafter described with reference to FIG. 7. Theconstruction of the hose with a protector according to the SeventhPreferred Embodiment is as follows: there is formed a ring 36 which goesaround, in the circumferential direction, on the inner peripheralsurface side of the connecting portion 35 of the engager 30 in thepresent hose with a protector; at the same time, there is formed a ringshaped convex 39 which is shape symmetrical to the ring groove 36 on theinner peripheral surface side of the return portion 38; furthermore, theportion which goes in contact with this ring groove 36 of the edgeportion 12 of the hose body 10 becomes a convex shape at the outerperipheral surface side; at the inner peripheral surface side, there isprovided a ring 13 which goes around in the circumferential direction ofa concave shape and whose diameter is enlarged; this ring 13 whosediameter is enlarged is engaged with and fixed to the ring groove 36;and furthermore, the ring-shaped convex 39 of the return portion 38 isengaged with the concave-shaped ring groove 13 at the inner peripheralsurface side of this ring.

In the hose with a protector of this Sixth Preferred Embodiment, as inthe same manner in the Second Preferred Embodiment, the movement, whichis relative to the return portion 38 and the edge portion 12 of the hosebody 10 in the axial direction, is regulated by the ring 13 of the hosebody 10. Accordingly, when the nipple is inserted and fixed, the returnportion 38 is regulated to move relatively to the edge portion 12 of thehose body 10 in the axial direction. On the outer peripheral surface ofthe tip portion of the nipple 50 which is inserted and fixed, there isformed a convex-shaped ring 51 which is engaged with the concave-shapedgroove of the ring 13 so that it secures the inserting and engaging ofthe nipple more reliably. The insertion resistance is increased justbefore the inserting and engaging of the nipple 50 and the insertionresistance is reduced at the time of engaging. So there is an advantagethat one can easily know the inserting and engaging of the nipple 50.

In the hose with a protector according to this Six preferred Embodiment,after the nipple 50 is inserted into and engaged with the engager 30, aband-shaped clamping member 55 is installed on the outer peripheralsurface of the engager 30, the engager 30 is clamped to the nipple 50 inthe axial direction, and the engaging of the nipple 50 and the engager30 is strengthened.

Seventh Preferred Embodiment

Next, the Seventh Preferred Embodiment of the present hose with aprotector will be hereinafter described with reference to FIG. 8. In thehose with a protector of this Seventh Preferred Embodiment, there isprovided a slant 37a on the inner peripheral surface of boundary portion37 between the return portion 38 and the connecting portion 35. Owing tothis, when the return portion 38 is folded back, there is provided aslant 37a of the return portion through the outer edge portion to theinside of the hose with a protector. Therefore the nipple 50 can beeasily inserted into the hose with a protector.

Eighth Preferred Embodiment

Next, the Eighth Preferred Embodiment of the present hose with aprotector will be hereinafter described with reference to FIG. 9. Asshown in FIGS. 9(a) and 9(b), in the hose with a protector according tothe Eighth Preffered Embodiment, on at least one of the inner peripheralsurface and the outer peripheral surface of the return portion 38, thereare provided ring-shaped projections 38a and 38b which are perpendicularto the direction of length of the return portion 38. Owing to this, theprojections 38a and 38b work the same function as that of the O-ring,therefore sealing ability of the hose with a protector can be improved.In the case which the projection 38a is provided on the inner side, whenthe nipple 50 is inserted into the hose with a protector, the returnportion 38 is hard to be torn off when the extracting force is affectedon the nipple 50. Accordingly, the nipple 50 is prevented from beingextracted together with the stripping of the return portion 38.Furthermore, when the projection 38b is provided on the outer side, theopening area of the hose with a protector can be enlarged at the outeredge portion. Accordingly it is easy to insert the nipple 50 into thehose with a protector.

Concerning the shape of the projections 38a and 38b, it is not limitedto be semi-circular. As shown in FIG. 9(c) and 9(d), the projections canbe sawtooth shaped 38c and 38d. Furthermore, the projections can beprovided on both of inner side surface and outer side surface (notshown).

Ninth Preferred Embodiment

Next, the Ninth Preferred Embodiment of the hose with a protector willbe hereinafter described with reference to FIG. 10. As shown in FIG.10(a), in the hose with a protector according to the Ninth PreferredEmbodiment, there is provided a ring-shaped projection 38a which isperpendicular to the direction of the length of the return portion 38together with the ring-shaped groove 35a which is engaged with thering-shaped projection 38a at the inner side surface of the connectingportion 35. Because the ring-shaped projection 38a is engaged with thering-shaped groove 35a, the stripping of the return portion 38 can beprevented surely owing to the combination effect between the ring-shapedprojection 38a and ring-shaped groove 35a after the nipple 50 isinserted into the hose with a protector and when the force extractingthe nipple 50 is operated. As shown in FIG. 10(b), the ring-shapedprojection 38a may be provided at the tip of the return portion 38 andring-shaped groove 35a may be provided so as to combine the ring-shapedprojection 38a when the return portion 38 is folded back to theconnecting portion 35. Also as shown in FIG. 10(c), there can beprovided a ring-shaped projection 14 at the edge portion 12 of the hosebody 10 so that it may be possible to engage the ring-shaped projection14 with the ring-shaped groove 38e which is provided at the tip of thereturn portion 38.

Tenth Preferred Embodiment

Next, the Tenth Preferred Embodiment of the present hose with aprotector will be hereinafter described with reference to FIG. 11. Asshown in FIG. 11(a), in the hose with a protector according to the TenthPreferred Embodiment, there is provided the edge portion 12 of the hosebody 10 so as to extend to the middle portion of the connecting portion35 of the engager 30.

Owing to this, one part of the return portion 38 directly overlaps theconnecting portion 38 on the portion which goes beyond the edge portion12 of the hose body 10 when the return portion 38 is bent. Thisoverlapping portion W is made of only rubber into which the edge portion12 of the hard hose body 10 does not get, so the portion W is high inelasticity. Accordingly, it is easy to insert the nipple 50 into theengager 30. The anti-gasoline permeability in the engager 30 is ensuredby the overlapping portion of the edge portion 12 of the hose body 10 ofthe return portion 38. As shown in FIG. 11(b), a concave portion 38e andconvex portion 38f are provided at the connecting portion 35 where thereturn portion 38 and the edge portion 12 do not overlap and the concaveportion 38e and the convex portion 38f are engaged with each other sothat the nipple 50 is prevented from being extracted caused by theoccurrence of strips of the return portion 38 when the extracting forceis affected on the nipple 50.

Eleventh Preferred Embodiment

Next, the Eleventh preferred Embodiment of the hose with a protectorwill be herein after described with reference to FIG. 12. In the hosewith a protector according to the Eleventh Preferred Embodiment, asshown in FIG. 12(a) the hose body 10 has a two-layer structure. Namely,the inner side of the hose body 10 comprises the layer 10b which hasimproved anti-gasoline permeability and the outer side of the hose body10 comprises a layer 10c which has improved adhesive property. The layer10c which has an improved adhesive property by painting an adhesivethereon or it may be obtained by surface treatments such as sodiumetching treatment, plasma flame treatment and sputtering on the outerside surface of the layer 10b which has improved anti-gasolinepermeability. As mentioned above, the outer side of the hose body 10 isthe layer 10c which has improved adhesive property so that it ispossible to directly bind the hose body 10 with the engager 30 and theprotector 20. Accordingly, when the hose body 10 is thin, the hose body10 is prevented from being indented toward the inner side (so calledslip state) even when the inside of the hose is in a negative pressurestate. Accordingly the selecting range of the thickness of the hose body10 can be widened.

As shown in FIG. 12(b), the inner side of the hose body 10 may comprisethe layer 10b which has improved anti-gasoline permeability, and theouter side of the hose body may comprise the layer 10c which is soft andwhich has improved flexibility. The thickness of the layer 10b which isat the portion beside the edge portion 12 and which is hard and hasimproved anti-gasoline permeability may be increased so as to improvethe strength of the hose body 10. Furthermore at the edge portion 12,the thickness of the layer 10c which is the outer side layer and whichhas improved flexibility may be widened. By the construction mentionedabove, it is easy to insert the nipple 50.

Twelfth Preferred Embodiment

Next, the Twelfth Preferred Embodiment of the hose with a protector willbe hereinafter described with reference to FIG. 13. In the hose with aprotector according to the Twelfth Preferred Embodiment, there isprovided a space between the hose body 10 and the protector 20 excludingthe edge portion 12 so that this space may function as a heat resistantlayer. The hose with a protector according to this Twelfth PreferredEmbodiment is produced as follow: the hose body 10 is molded in advancebeing apart from the engager 30 and the protector 20; the hose body 10,which is molded previously, is later assembled to the engager 30 and theprotector 20; the edge portion 12 of the hose body 10 is inserted andclamped between the connecting portion 35 and the return portion 38 ofthe engager 30.

A space between the hose body 10 and the protector 20 is formed. Owingto this space, the heat is excluded by the space even when the protector20 reaches a high temperature by heating so that the heat is hard to beconducted. Accordingly, the melting of the hose body 10 is slow and thefire resistance of the hose with a protector can be improved.

By providing the space between the protector 20 and the hose body 10,both of the protector 20 and the hose body 10 tend to slide in thelongitudinal direction. However edge portion 12 of the hose body 10 isinserted and clamped between the connecting portion 35 and the returnportion 38 of the engager 30 so that the position of the hose body 10 isfixed. Therefore the slide between the protector 20 and the hose body 10can be prevented from occurring.

The hoses with a protector through the First Preferred Embodiment to theEleventh Preferred Embodiment have the structure in which the spacebetween the hose body 10 and the protector 20 is not provided. As shownin the hose with a protector of the Twelfth Preferred Embodiment, thespace between the hose body 10 and the protector 20 may be provided. Thehose body 10 and the protector 20 may have bellows shapes havingdifferent pitches respectively. Accordingly, even when the hose body 10may be made of hard resin and metal resin, the obtained hose with aprotector can ensure its elasticity. The slide of the protector 20 andthe hose body 10 in the longitudinal direction can be prevented byfixing the edge portion 12 of the hose body 10 to the engager 30.

In each of the above-mentioned Preferred Embodiments, the edge portion12 of the hose 10 was inserted into and fixed to the engager 30, howeverthe engager 30 may be adhered to the edge portion 12 of the hose body10. By this binding, when the extracting force is acted on the nipple50, the return portion 38 of the engager 30 is prevented from beingpeeled off so that the nipple 50 can be prevented from being extracted.

Also in each of the above-mentioned Preferred Embodiments, the thicknessof the hose body 10 corresponds to the middle portion of the bellowsshaped portion 11 and the edge portion 12, however the edge portion maybe thinner compared to the thickness of the middle portion. Owing tothis, the engager 30 of the hose edge portion into which the nipple 50is inserted is improved in its elasticity. Accordingly it is easy toinsert the nipple 50 into the hose. The middle portion of the bellowsshaped portion 11 is generally thick, therefore the hose is notdeteriorated in its anti-gasoline permeability.

Furthermore, in each of the above-mentioned Preferred Embodiments, hosebody 10 is made of polyamide resin. Instead of polyamide resin, as thematerial of the hose body 10, the followings may be used: resins whichhave improved gasoline resistance and anti-gasoline permeability such asfluorocarbon resin, polyester resin, polyvinyl chloride resin,polyacetal resin, PPS resin; and metals such as stainless steel andaluminium.

Thirteenth Preferred Embodiment

Next, the Thirteenth Preferred Embodiment of the hose with a protectorwill be hereinafter described with reference to FIG. 14. In the hosewith a protector according to this Thirteenth Preferred Embodiment, thehose body 10 shown in FIG. 14(a) is employed. This hose body 10 is madeof polyamide resin is in the same manner as that of the First PreferredEmbodiment and it was produced by blow molding in advance. The engager30 and the protector 20 are, as shown in FIG. 14(b), integrally diemolded by using rubber. In this Thirteenth Preferred Embodiment, at theengager 30 shown in the right side of the FIG. 14(b), the return portion38 is molded in the state in which the return portion is folded back inadvance. The engager 30 shown in the left side of the FIG. 14(b) ismolded in the state in which it is extended in the axial direction. Atthe connecting portion 35 of the engager 30, a ring-shaped groove 35g isformed and at the return portion 38, a ring-shaped projection 35f isformed at the position corresponding to the position of the ring-shapedgroove 35g. In the state in which the return portion 38 is folded back,ring-shaped deep groove is formed having the portion whose diameter isenlarged as shown in the engager 30 of the right side in the FIG. 14(b).

In the hose with a protector according to the Thirteenth PreferredEmbodiment, as shown in FIG. 14(c), the edge portion 12 of the hose body10 is inserted into the groove between the connecting portion 35 and thereturn portion 38 of the engager 30 (shown on the right side of FIG.14(c)). Finally as shown in FIG. 14(d), the return portion 38 (shown onthe right side of FIG. 14(d)) is folded back to the axial center sideand the hose with a protector according to the Thirteenth PreferredEmbodiment is produced. At the edge portion 12 of the hose body 10, anenlarged diameter portion 13 is provided. By the diameter enlargedportion 13 of the edge portion 12, the groove 35g of the connectingportion 35 and the ring-shaped projection 35f of the return portion 38,the edge portion 12 of the hose body 10 is fixed to the groove betweenthe connecting portion 35 and the return portion 38 without sliding inthe axial direction.

In this Thirteenth Preferred Embodiment, the return portion 38 of theengager 30 is folded back in advance. Therefore the working efficiencyis rather high because it is not necessary to fold back the returnportion. In the case when the hose body 10 is installed to the engager30 afterwards, the engagers 30 and 30 on both sides may be molded in thebent sate in advance.

Fourteenth Preferred Embodiment

The Fourteenth Preferred Embodiment of the hose with a protector will behereinafter described with reference to FIG. 15. In the hose with aprotector according to this Fourteenth Preferred Embodiment, at theboundary portion between the protector 20 and the engager 30, theportion 29, whose inner diameter is small, is projected in the ringshape toward the axial core side. Also at the boundary portion betweenthe bellows shaped portion 11 of the hose body 10 and the edge portion12, a ring groove 19 which engages with the portion 29 projecting in thering shape in the above-mentioned axial core side is formed and engaged.Accordingly the protector 20 having the engager 30 and the hose body 10are integrated more securely. So the possibility that the hose body 10comes out form the engager 30 is reduced more.

In the hose with a protector according to this Fourteenth PreferredEmbodiment, a fastening tool 55 is used for fastening to the nipple 50,the engager 30 is pressed toward the axial core direction from the outerperipheral side of the engager 30. Accordingly, the engager 30 isclamped by the outer peripheral surface of the nipple 50.

Fifteenth Preferred Embodiment

The Fifteenth Preferred Embodiment of the hose with a protector will behereinafter described with reference to FIG. 16. In the hose with aprotector according to this Fifteenth Preferred Embodiment, the edgeportion 12 of the hose body 10 which is used in the hose with aprotector according to the Fourteenth Preferred Embodiment is cut shortto the extent that the an enlarged diameter portion 51 at the tip sideof the nipple 50 which is inserted and held can be inserted into theedge portion 12 of the hose body 10. The hard hose body 10 is notinserted into most of the engager 30 in the axial direction, thereforeit is easy to insert the nipple 50. Furthermore, the tip portion of thereturn portion 35 of the engager 30 is clamped between the edge portion12 of the hose body 10 and the enlarged diameter portion 51 of thenipple 50, therefore this clamping portion functions in the sealingactivity. Accordingly the sealing ability is improved in this FifteenthPreferred Embodiment.

Sixteenth Preferred Embodiment

This hose with a protector is shown in FIG. 17. This hose with aprotector according to the Sixteenth Preferred Embodiment comprises thehose body 10 made of polyamide resin and the protector 20 having theengager 30 made of rubber and each of them are produced independently.

The hose body 10 comprises a bellows shaped portion 11 which ispositioned at the middle portion thereof and the edge portions 12 and 12which are integrally molded at both sides. Each of edge portions 12 and12 respectively comprises: a first reduced diameter portion 121 whosediameter is small and which is adjacent to the bellows shaped portion11; a first enlarged diameter portion 122 whose diameter is large; asecond reduced diameter portion 123; a second enlarged diameter portion124 whose cross section is semicircular; and trumpet-shaped edge portion125 whose tip is flared. On the other hand, the protector 20 having theengager 30 is formed in a bellows shape whose wave is low and theengager 30 is formed so as to have more a reduced diameter and largerthickness compared with those of the protector 20. The shape of theinner peripheral surface of the engager 30 corresponds to the followingportions. The following portions include: a first reduced diameterportion 301 which is shaped symmetrical to the outer peripheral surfaceof the edge portion 12 of the hose body 10 which is engaged with theengager; a first enlarged diameter portion 302 whose diameter is largeand a second reduced diameter portion 303; a second enlarged diameterportion 304 whose cross section is semicircular; a trumpet-shapedbottom-owned groove 305 whose tip is flared; and a ring-shaped lip 306which is formed by this trumpet-shaped bottom-owned groove. Furthermore,in the shape of the outer peripheral surface of the engager 30, thediameter through the position which corresponds to the bottom of thetrumpet-shaped bottom owned groove 305 along to the edge side portionthereof is slightly smaller and a small projection is provided at thetip side.

The hose body 10 is inserted into the protector 20 having the engager30. And the edge portions 12 and 12 of the hose body 10 are engaged withthe inner peripheral surface of the engager 30 respectively. Thetrumpet-shaped edge portion 125 of each of edge portions 12 and 12 ispressed against and mounted on the trumpet-shaped and bottom-ownedgroove 305 of the engager 30. Owing to the installment of thistrumpet-shaped edge portion 125, the tip of the lip in the ring-shapedlip 306 of the engager 30 is projected in the axial core side as clearlyshown in the right side of the FIG. 17.

When this hose with a protector is inserted into the nipple 50, theenlarged diameter portion 51 positioned at the tip of the nipple 50 isengaged into the second enlarged diameter portion 124 of the edgeportion 12 of the hose body 10, and the ring shaped lip 306 is clampedbetween the trumpet-shaped edge portion 125 of the edge portion 12 ofthe hose body 10 and the outer peripheral surface of the nipple 50.Accordingly, the ring-shaped lip 306 seals the space between the hosebody 10 and the nipple 50.

In the hose with a protector according to this Sixteenth PreferredEmbodiment, length the of the trumpet-shaped edge portion 125 of thehose body 10 is small in the axial direction direction. Therefore, it iseasy to install the engager 30 in the trumpet-shaped and bottom-ownedgroove 305 and the assembling performance is improved in this SixteenthPreferred Embodiment. Also the engager 30 and the hose body 10 of theedge portion 12 are respectively engaged with the enlarged diameterportion, reduced diameter portion and the enlarged diameter portionwhich are positioned continuously in the axial direction, therefore, theintegrity of them is improved. Furthermore, the ring-shaped lip 306functions as a seal, therefore the sealing property is improved.

Seventeenth Preferred Embodiment

The cross sectional view which illustrates the major portion of the hosewith a protector according to the Seventeenth Preferred Embodiment isshown in FIG. 18. The hose with a protector according to this PreferredEmbodiment has the shape which is slightly different from that of thehose with a protector according to the Sixteenth Preferred Embodiment.The differences reside in the shapes of the edge portion 12 of the hosebody 10 and the inner peripheral surface of the engager 30. Namely, thespace positioned between the trumpet-shaped edge portion 125 of the edgeportion 12 of the hose body 10 and the the second enlarged diameterportion 304 whose cross section is semicircular is enlarged in thisSeventeenth Preferred Embodiment. Owing to this, the trumpet-shaped edgeportion 125 of the edge portion 12 of the hose body 10 is clamped by theengager 30 and the nipple 50, and it also clamped by the clamp 55 andnipple 50.

In the hose with a protector according to this Seventeenth PreferredEmbodiment, the edge portion 12 of the hose body 10 is clamped by theclamp 55 to the nipple 50, therefore the bonding of the nipple 50 andthe hose body 10 is strengthened.

Eighteenth Preferred Embodiment

The cross sectional view which illustrates the major portion of the hosewith a protector according to the Eighteenth Preferred Embodiment isshown in FIG. 19. In this hose with a protector of this EighteenthPreferred Embodiment, an enlarged diameter portion 13 is provided at themiddle portion in the axial direction of the edge portion 12 thereof andthere is provided a ring-shaped stopper 381 which projects toward theaxial core direction at the tip of the return portion 38 of the engager30.

The position of the enlarged direction 13 of the edge portion 12 of thepresent hose body 10 corresponds to the position of an enlarged diameterportion 51 of the nipple 50 into which the hose body is inserted.Accordingly, the enlarged diameter portion 51 of the nipple 50 isengaged with the enlarged diameter portion 13 of the edge portion 12 andat the same time the tip of the nipple 50 is connected and engaged witha ring-shaped stopper 381. Therefore, engaging of the nipple 50 isconducted easily.

Nineteenth Preferred Embodiment

The cross sectional view which illustrate the major portion of the hosewith a protector according to the Nineteenth Preferred Embodiment isshown in FIG. 20. In this hose with a protector according to theNineteenth Preferred Embodiment, at the tip portion of the edge portion12 of the hose body 10 thereof, a plurality of through holes 121 areprovided in the circumferential direction and in the ring shape. At theconnecting portion 35 of the engager 30, a concave 351 is formed at theposition corresponding to the through hole 121 of the edge portion 12and a convex portion 382 which engages with the concave portion 351 isformed at the position corresponding to the through hole 121 of thereturn portion 38. When the return portion 38 is returned, this convexportion 382 penetrates the through hole 121 and it is engaged with theconcave portion 351 of the connecting portion 35. By the engaging of theconvex portion 382 and the concave portion 351, the return portion 38 isintegrally connected by the connecting portion 35. Owing to this, whenthe nipple is extracted, the return portion 38 is prevented from beingextracted from the connecting portion 35.

Twentieth Preferred Embodiment

The cross sectional view which illustrates the major portion of the hosewith a protector according to the Twentieth Preferred Embodiment isshown in FIG. 21(a). The cross sectional view of the hose with aprotector of this Twentieth Preferred Embodiment is as shown in FIG.21(b) and the diameter of the edge portion 12 of the hose body 10 can beenlarged and this edge portion has the wave shape having irregularity inthe circumferential direction. The ring groove provided at the engager30 formed integrally with the hose body 10 has also the wave shapehaving irregularity in the circumferential direction so as to suit thecross-sectional shape of the edge portion 12.

In the hose with a protector of this Preferred Embodiment, the edgeportion 12 of the hose body 10 has the wave shape having irregularity inthe circumferential direction. Therefore, enlarging and reducingdiameter of the edge portion 12 can be conducted easily. Accordingly, itis easy to mount the nipple at the engager 30.

Twenty-first Preferred Embodiment

The Twenty-first Preferred Embodiment of the hose with a protector willbe hereinafter described with reference to FIG. 22. The characteristicfeature of the hose with a protector of this Twenty-first PreferredEmbodiment resides in the fact that the protector 20 is formed of twocomponents which are in the engaging relation in which they can be movedrelatively in the axial direction with respect to each other. Namely,the protector 20 comprises a first protector 23 whose outer peripheralradius is small and a second protector 24 which covers the firstprotector 23 coaxially and whose inner peripheral radius is big. Thefirst protector 23 and the second protector 24 are in a telescopingrelation and the portion where both of them overlap each other can beenlarged. The engagers 30 and 30 are formed integrally at the edgeportions of the first protector 23 and the second protector 24respectively.

The hose with a protector of this Twenty-first Preferred Embodiment is,as shown in FIG. 22 (b), produced as follows: the first protector 23,the second protector 24 and the hose body 10 are produced individually;then, the assembly is accomplished by mounting the edge portions 12 ofthe hose body 10 at the ring groove of the engagers 30 which are formedintegrally with the first protector 23 and the second protector 24respectively. Because a pair of the engagers 30 and 30 are formed as theseparate components, each of edge portions 12 and 12 of the hose body 10can be inserted into the ring grooves of the engagers 30 and 30respectively so that the inserting operation can be conducted veryeasily.

As shown in FIG. 22(c), the hose with a protector of this Twenty-firstPreferred Embodiment has high flexibility because the protector 20 canbe expanded in the axial direction. Also it is not necessary to form theprotector 20 into the bellows shape so that the die cost is low.Furthermore, the same protector can be used for a plurality of hoseswith protectors having different lengths of the hose bodies 10 in theaxial direction.

Twenty-second Preferred Embodiment

The Twenty-second Preferred Embodiment of the hose with a protector willbe hereinafter described with reference to FIG. 23. This hose with aprotector of this Twenty-second Preferred Embodiment comprises a hosebody 10 made of resin, a protector 20 made of rubber and an engager 30made of rubber.

The hose body 10 comprises bellows shaped portion 11 and edge portions12 and 12 which are formed integrally at both ends thereof. At each ofedge portions 12 and 12, enlarged diameter portions 125 and 125 projecttoward the outside in a radial direction from a middle position takenalong the axial direction and which are ring shaped. And at the tip ofthe enlarged diameter enlarging portion 125, a ring shaped groove 126 isformed. At this ring shaped groove 126, a ring-shaped enlarged diameterportion 51 of the nipple 50 of the mating pipe is engaged elastically.

On the other hand, at the inner peripheral surface of the edge portion12, a hard ring 385 is engaged. Hence, the hard ring 385 may be made ofresin or metal.

At the boundary portion of the edge portion 12 and the bellows shapedportion 11, a ring-shaped projection portion 127 is formed and itprojects toward the inside in a radial direction. This projection 127determines the position of the hard ring 385.

The protector 20 comprises edge portions 205 which are thick andcylindrical shaped and bellows shaped portion 20a which is positionedbetween them. A predetermined space is formed between each of bellowsshaped portions 20a and 11 of the protector 20 and the hose body 10. Theportion between them is an air layer 42.

The engager 30 is a short cylinder member and at that member, a fixedportion 307 and an engaging sealing portion 308 are formed in the axialdirection continuously. At this engager 30, the fixed portion 307 isclamped by the hose body 10 and each of edge portions 12 and 205 of theprotector 20 in a sandwiched and they are engaged. Furthermore, by usingthe hard ring 385 and resin ring 206 which is provided on the outersurface of the edge portion 205 of the protector 20, the fixed portion307 and each of edge portions 12 and 205 of the hose body 10 and theprotector 20 are clamped and pressed from inner and outer surfaces andthey are fixed which each other.

In the state in which the hose body 10, the protector 20 and the engager30 are set in an injection die, this resin ring 206 is molded byinjection so that together with the hard ring 385, the fixed portion ofthe hose body 10, the protector 20 and the engager 30 are in the pressedstate.

Instead of using the resin ring 206 formed by injection molding, a metalring may be used to be caulked secure.

The engager 30 is directly engaged with the outer peripheral surface ofthe nipple 50 at engaging sealing portion 308 which continues to thefixed portion 307 and furthermore the engager 30 is clamped by theclamping member 55.

The hose body 10 of this Twenty-second Preferred Embodiment is made ofpolyamide resin, the protector 20 is made of CR rubber and the engager30 is made of NBC PVC rubber.

However, the hose body 10 may be a resin single layer and it also hasthe laminated structure having more than two layers. In thisTwenty-second Preferred Embodiment, the resin material is blow molded toform the hose body 10.

Here, the materials for the protector 20 and the engager 30 can beselected from suitable materials.

The dimensions of the whole of and each member of the hose with aprotector in this Twenty-second Preferred Embodiment are as follows: thetotal length of the hose is 240 mm; the thickness of the bellows shapedportion 11 of the hose body 10 is 0.5 mm; each pitch of each bellows ofthe bellows shaped portion 11 is 6 mm; and the height thereof is 6 mm.

In the protector 20, the thickness of the bellows shaped portion 206 is2 mm, the thickness of the cylinder shaped edge portion 205 is 2 mm.Furthermore, in the engager 30, the length in the axial direction is 60mm, the thickness of the fixed portion 307 is 4.5 mm and the thicknessof the engaging sealing portion 308 is 5 mm. The resin ring 206 is madeof polyamide resin. These dimensions are cited only for examples.

In the hose with a protector of this Twenty-second Preferred Embodiment,the hose body 10, the protector 20 and the engager 30 are integrallyassembled. Accordingly, only if the engaging sealing portion 308 of theengager 30 is inserted into the nipple 50 of the mating pipe and clampsit, the hose with a protector comprising the hose body 10, the protector20 and the engager 30 can be easily connected with the nipple 50.Therefore the connecting working performance is improved.

The engager 30 is elastic and it is very well adhered to the nipple 50without clearance and the sealing performance is also good.

Furthermore, in this Twenty-second Preferred Embodiment, the tip of thehose body 10 overlaps the tip of the nipple 50 in the elasticallyengaging state and the adherence state so that the sealing performanceis good and the engager 30 is not directly exposed to liquid (such asgasoline) at the inside thereof. Accordingly, the deterioration of theengager 30 by gasoline is inhibited from occurring and at the same time,the engager 30 prevents gasoline at the inside from permeating to theoutside very well. Furthermore, the position of engaging the nipple 50and the tip of the hose body 10 is prevented from sliding so that thereliability at the connecting portion is improved.

Furthermore, the hose body 10 is made of resin and it has improvedanti-gasoline resistance and anti-gasoline permeability. On the otherhand, because the protector 20 made of anti-flame rubber is provided atthe outside thereof, the hose body 10 has improved heat resistance andflame resistance.

It is not necessary to employ expensive materials such as fluoro-rubber,therefore the cost of the hose with a protector of this Twenty-secondPreferred Embodiment can be reduced.

Furthermore, in this Twenty-second Preferred Embodiment, the edgeportion 12 of the hose body 10 and the engager 30 are engaged in theadhered state and they are clamped and pressed by the hard ring 385 andthe resin ring 206 through the edge portion 205 of the protector 20 fromboth internal and external surfaces. Also, at the edge portion 12 of thehose body 10, the ring projection 125 which projects in the axialdirection and outward is formed. This projection 125 is in the statewhich the projection 125 bites into the engager 30 so that the sealingproperty of the engaging portion of the hose body 10 and the engager 30is also improved.

In the case of the hose with a protector of this Twenty-second PreferredEmbodiment, the engager 30 and the protector 20 are produced as separatebodies, therefore, there is an advantage that the engager 30 and theprotector 20 can comprise separate rubber materials which have differentcharacteristics.

Namely, the engager 30 can comprise rubber material having improvedanti-gasoline permeability and the protector 20 can comprise rubbermaterial having improved flame resistance. So in response to thefeatures which are necessary to each portion, the appropriate rubbermaterial is used. Accordingly, it is possible to provide the hose with aprotector having the necessary characteristics by using cheap rubbermaterials.

With reference to the method in which the resin ring 206 is injectionmolded and at the same time, edge portions 12 and 205 of the hose body10 and the protector 20 respectively, together with the fixed portion307 of the engager 30 are fixed in the clamped and pressed state by theresin ring 206 and the hard ring 385, it can be suitable to use themethod shown in FIG. 24.

This method, as shown in FIG. 24 (A), comprises the following steps of:pressure members 44 and 46 are formed at the injection molding die 40;the hard ring 385, the hose body 10, the protector 20 and the engager 30are set and die matched to the injection molding die 40 and 42; and atthis time, at the pressure portion members 44 and 46, the edge portion205 of the protector 20 is pressed down (refer to FIG. 24 (B)).

Inside of a cavity 48 which is formed between these pressed members 44and 46, the resin material is injected from a filler hole 60 which isformed at the middle position of in the axial direction and in theinwardly radial direction so that the resin ring 206 is molded (refer toFIG. 24 (C)). At the same time, together with the hard ring 385, theedge portion 12 of the hose body 10, the fixed portion 307 of theengager 30 and the edge portion 205 of the protector 20 are pressed andfixed.

Based on this method, the melted resin injected from the filler hole 60presses the engager 30 through the edge portion 205 of the protector 20against the edge portion 12 of the hose body 10 so that this method canobtain the effect that the sealing between them is secured.

Twenty-third Preferred Embodiment

FIG. 25 shows the hose with a protector of the Twenty-third PreferredEmbodiment in the present invention. In this Twenty-third PreferredEmbodiment, parts in the axial direction of the protector 20 and thecylinder shaped edge portions 12 and 12 of the hose body 10 are formedin convex curved shapes which project radially outwardly and annularly.And into the inside of the annular engaging concave portion 207 which isformed at the edge portion 206 of the protector 20 and which is inradial and inward direction, the convex curved portion 127 (engagingconvex portion) of the edge portion 12 of the hose body 10 is inserted.

Into the inside of the inwardly and annularly engaging concave portion128 of the edge portion 12 of the hose body 10, the annular and engagingconvex portion 305 of the engager 30 is inserted. Accordingly, theengager 30, the edge portion 206 of the protector 20 and the edgeportion 12 of the hose body 10 are fixed to each other.

At the edge portion 12 of the hose body 10, an annular and secondengaging concave 129 which extends radially outward at the positionadjacent to the engaging concave 128 is formed. Into the inside of thissecond engaging concave 129, the inward and second convex curvedportions (engaging convex portions) 208 and 208 of the edge portion 206of the protector 20 are inserted and fixed to each other.

As shown in FIG. 26 (A), the middle part in the axial direction of theedge portion 12 in the hose body 10 is annularly curved inwardly in theradial direction and then it is possible for the filling of the engager30 to bite into the inside of this concave portion 124. Also as shown inFIG. 26 (B), a pair of projections 125 and 124 which are radially inwardand annular are provided the edge portion 12 so that the position of thehard ring 385 can be determined by using these projections 125 and 124.

Besides the above-mentioned Preferred Embodiments, the present inventioncan be applied to other hoses such as an air intake hose for anautomobile and besides the above-mentioned materials, various kinds ofmaterials can be used for the hose body and the protector in thisinvention. It will be apparent to one of ordinary skill in the art thatmany changes and modifications can be made thereto without departingfrom the spirit or scope of the present invention as set forth hereinincluding the appended claims.

We claim:
 1. A hose comprisinga central portion and two end portionseach located at opposite ends of said central portion, a tubular shapedouter body extending from said two end portions and across said centralportion, a tubular shaped inner body fixed within said outer body andextending from said two end portions and across said central portion,said outer body being made of rubber elastic material, an engagerlocated at said two end portions being made of rubber elastic materialfor receiving and sealingly engaging a nipple in said engager in awater-tight seal and the nipple being held within said engager at aninterior surface of said engager by the elasticity of said rubberelastic material, said inner body being made of resin or metal and beingcoaxially located inside of said outer body, said inner body, said outerbody, and said engager being fixed together at each of said two endportions by a pair of rings, one of said rings being located inside ofsaid inner body and being made of resin or metal and the other of saidrings being located outside of said outer body.
 2. A hose according toclaim 1, wherein said rubber elastic material is vulcanized rubber.
 3. Ahose according to claim 1, wherein said engager has a sealing portionwhich is clamped between said pair of rings so that said sealing portionand said nipple are sealed.
 4. A hose according to claim 1, wherein anair layer space is located between said outer body and said inner bodyat said central portion.